It's not bad stuff (even if it looks like an alien lifeform growing) and if you want to grow your own...good for you. Likewise, try home grown sauerkraut, kimchee, kefir or yoghurt. Home made vinegar or cheese for that matter, if you're so inclined. These probiotics and/or fermented foods are all good for various ailments. If you're interested in making sauerkraut or kimchee, for instance, now's the time as they can grow in a cool garage without being all stanky in the house.
I buy yoghurt, cheese and kraut these days, but I've helped make them all in the past. I still do the home-made wine vinegar thing, it's easy and soothes my waste-not, want-not soul (bad half-bottles of wine still makes good whole bottles of vinegar).

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A man can never own too much red wine, too many books, or too much ammunition. -- R. Kipling